The Difference Between Temporary Factor- Price Differentials and Equilibrium Factor-

The difference between temporary factor- price differentials and equilibrium factor- price differentials is that

A) temporary differentials are affected by supply and demand whereas equilibrium differentials are not.
B) the government can only eliminate equilibrium differentials.
C) equilibrium differentials lead to,and are eliminated by,factor mobility whereas temporary differentials do not.
D) only equilibrium differentials are interesting for policy purposes.
E) temporary differentials lead to,and are eliminated by,factor mobility whereas equilibrium differentials do not.